ABUJA, March 5 (Reuters) - A German man was released unharmed late on Tuesday in the Niger Delta in Nigeria, about 12 hours after he was seized by unknown gunmen who killed a driver and two soldiers, a source at his company said on Wednesday.

The source at Julius Berger <GBFG.DE>, a German-Nigerian construction group, said no ransom was paid for the German hostage and his release was due to fast work by the Nigerian security services.

(Editing by Michael Winfrey)

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